107 citations · 380 across the 11 of their papers we have counts for
11 papers
Spinning and tumbling of long fibers in isotropic turbulence
Theresa B. Oehmke, Ankur D. Bordoloi, Evan Variano +1
We simultaneously measure both spinning and tumbling components of rotation for long near-neutrally buoyant fibers in homogeneous and isotropic turbulence. The lengths and diameter…
Lagrangian time scale of rotation for inertial fibers in isotropic turbulence
Ankur D. Bordoloi, Gautier Verhille, Evan Variano
Using time-resolved measurements of the orientation of rigid inertial fibers in a turbulence-tank, we investigate the autocorrelation of their tumbling rate. The correlation time (…
Turbulence statistics in a negatively buoyant multiphase plume
Ankur D. Bordoloi, Chris C. K. Lai, Laura K. Clark +2
We investigate the turbulence statistics in a {multiphase plume made of heavy particles (particle Reynolds number at terminal velocity is 450)}. Using refractive-index-matched ster…
Sedimentation of elongated non-motile prolate spheroids in homogenous isotropic turbulence
M. Niazi Ardekani, G. Sardina, L. Brandt +3
Phytoplankton are the foundation of aquatic food webs. Through photosynthesis, phytoplankton draw down CO2 at magnitudes equivalent to forests and other terrestrial plants and conv…
Rotations of small, inertialess triaxial ellipsoids in isotropic turbulence
Nimish Pujara, Evan Variano
The statistics of rotational motion of small, inertialess triaxial ellipsoids are computed along Lagrangian trajectories extracted from direct numerical simulations of homogeneous…
Wind-driven water motions in wetlands with emergent vegetation
Ian C. Tse, Cristina M. Poindexter, Evan A. Variano
Wetland biogeochemical transformations are affected by flow and mixing in wetland surface water. We investigate the influence of wind on wetland water flow by simultaneously measur…
Shape-dependence of particle rotation in isotropic turbulence
M. Byron, J. Einarsson, K. Gustavsson +3
We consider the rotation of neutrally buoyant axisymmetric particles suspended in isotropic turbulence. Using laboratory experiments as well as numerical and analytical calculation…
Homogeneity and isotropy in a laboratory turbulent flow
Gabriele Bellani, Evan A. Variano
We present a new design for a stirred tank that is forced by two parallel planar arrays of randomly actuated synthetic jets. This arrangement creates turbulence at high Reynolds nu…
Rotational diffusion of particles in turbulence
Colin R. Meyer, Evan A. Variano
Through laboratory measurements, we compare the rotation of spherical and ellipsoidal particles in homogeneous, isotropic turbulence. We find that the particles' angular velocity s…
Refractive-index-matched hydrogel materials for modeling flow-structure interactions
Margaret L. Byron, Evan A. Variano
In imaging-based studies of flow around solid objects, it is useful to have materials that are refractive-index-matched to the surrounding fluid. However, materials currently in us…
Slip-velocity of large neutrally-buoyant particles in turbulent flows
Gabriele Bellani, Evan A. Variano
We discuss possible definitions for a stochastic slip velocity that describes the relative motion between large particles and a turbulent flow. This definition is necessary because…